(400 − 20) * 2 = 400 * 2 − 20 * 2 = 760
(80 − 1) * 5 = 80 * 5 − 1 * 5 = 395
(25 − 9) * 4 = 25 * 4 − 9 * 4 = 64
(20 − 1) * 7 = 20 * 7 − 1 * 7 = 133
Вычисления:
400 * 2 = 4 * 2 * 100 = 8 * 100 = 800
20 * 2 = 2 * 2 * 10 = 4 * 10 = 40
$\snippet{name: op_column, sign: '-', x: '800', y: '40', z: '760'}$
80 * 5 = 8 * 5 * 10 = 40 * 10 = 400
$\snippet{name: op_column, sign: '-', x: '400', y: '5', z: '395'}$
$\snippet{name: op_column, sign: '‧', x: '25', y: '4', z: '100'}$
$\snippet{name: op_column, sign: '-', x: '100', y: '36', z: '64'}$
20 * 7 = 2 * 7 * 10 = 14 * 10 = 140
$\snippet{name: op_column, sign: '-', x: '140', y: '7', z: '133'}$